What is the value of the expression $20 - 40 + 60 - 80$ ?

-20

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-40

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-60

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-80

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Solution

The correct option is B -40
20 - 40 + 60 - 80 = -20 + 60 - 80
= 40 - 80 = -40

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50 - 40 + 60 - 30

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In the above figure, $∠ C A B = 60^{\circ}, ∠ C B A = 60^{\circ}$ . PQ is a tangent at A. What is the value of $∠ B A Q$ .

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